This is the official forum for Messenger Plus! Live, not for Windows Live Messenger
Try a quick google search for terms like "WLM support" and "Hotmail Support". The link below may be your best bet.
https://support.msn.com/contactus.aspx?mkt=en-gb&scrx=1
However, the best advice I can give you is to change your Hotmail password and to advise any of your friends who have entered their details into that site to do the same